Prometheus 7 Programmable Bead Door Kiln is a tabletop kiln, similar in size to a Paragon SC2. It is designed for firing precious metal clays like Art Clay Silver, PMC, and PMC Flex. It is also good for base metal clays, and glass fusing, enamelling, low fire ceramics, china painting, as well as annealing and hardening silver, and gold.
It's a 1100°C front-loading kiln, with a built-in, easy-to-use, 3-key digital programmable controller. This is exactly like our PRO7 PRG, but this model (PRO7 PRG BD) includes a 150mm x 57mm letterbox style bead-annealing door. The bead door is hinged at the top and opens upwards. Once open, the bead door does not stay held upright. The beads are built on bead mandrels or rods, which are then pushed in through the bead door, and the door rests on the mandrels.
The bead door is sometimes used to take a quick peep at china paints, enamels, glass, and glazes to check on their progress, or to adjust or move pieces of work. It gives you a wider view than a window, but the kiln will heat unevenly if you keep it fully open for too long: although not as much as opening the main door. Please remember to always use the correct eye and body protection if you're looking into a hot kiln.
Purists might tell you not to leave the bead door open but of course, when you're using bead mandrels it's slightly open all the time. As always, it depends on what you're using the kiln for and it's important to experiment to find what works for you.
FREE next working day 'signed for' (not timed) delivery to UK mainland!
*Please note - due to poor handling by couriers we are not able to ship kilns outside the UK mainland at this time.
The UK kiln is rated at 230V/1900W, so it plugs into a regular mains socket.
Includes a manufacturers warranty of 2 years.
The programmable controller means you can set what temperature you want the kiln to fire at (target temperature), and also tell it how fast you want it to heat up (ramp speed), and how long you want it to hold at the firing temperature (hold/soak time), and the kiln will then turn the heating off once it has completed the programme. If you want you can also say how slow it should cool down, and if it should hold at a temperature whilst cooling down.
You can set 9 programmes, and each programme can have up to 8 segments or steps. A segment could be like this: heat up at 300° C per hour, until you get to 800°C, then hold that temperature for 45 minutes.
To be able to set several segments with different heating speeds and temperatures are very useful if you're firing base metals, like copper and bronze (where you want to heat up slower and hold steady to burn the binder out at a lower temperature before the full firing at a higher temperature), or doing glass fusing (which needs a slow heating, and a slow cool down, with a soak/hold at a low temperature to anneal the glass once fused).
A good thing with programmes is that you only set them once, and they will stay there until you change them. So you could set one programme for firing silver clay, another for fusing glass coasters, and another for that perfect BRONZclay firing schedule you've come up with.
This kiln has a Orton AutoFire Express Digital Programmable Temperature Controller (like the one on Paragon, Sierra, and Evenheat kilns) which is programmed pretty much just like the one used on the Paragon SC2 Kiln.
The outer steel case measures 360mm x 370mm x 435mm, and is slotted for air circulation, so it keeps cool. The door opens 180° upright, and there's a small door vent above the bead door. It is normal for the metal above this vent and the door to discolour slightly with use.
The ceramic firing chamber, enclosed in an inner steel case, measures 230mm x 205mm x 155mm internally, and heats from the top, sides and bottom, with the fast-firing elements safely embedded in the ceramic.
If you wish, we're happy to pre-program your kiln for you for a fee. We would preset the most popular programs used by metal clay artists, so the kiln is ready to go out of the box. You still have 2 programs free to do with as you wish, and you are always free to amend the programs we have set for you. Please note that these programs are not locked, so you have full freedom to change them as you wish. These are the standard programs we would set for you, if you have any other programs you need, please let us know and we can see if we might be able to help:
PR01: 500ºC - 30mins, 870ºC - 60mins (recommended firing for Art Clay Silver 950 Sterling)
PRO2: 650ºC - 30mins (minimum firing for Art Clay Silver)
PR03: 800ºC - 30mins (recommended firing for Art Clay Silver, Art Clay Oil Paste, Prometheus Bronze)
PR04: 800ºC - 30mins with a slow ramp (Art Clay Silver Paper Type)
PR05: 970ºC - 30mins (Art Clay Copper)
PR06: 900ºC - 10mins (PMC+)
PR07: 700ºC - 10mins (PMC3 fast)
PR08: 600ºC - 45mins (PMC3 slow)
Controller: Orton Digital Programmable Temperature Controller - 9 programmes with 8 segments
Max Temp: 1100°C
Heating elements: 4; top, bottom and sides
External Size: 360 x 370 x 435 (width x depth x height) (mm)
Firing Chamber: 230 x 205 x 155 (width x depth x height) (mm)
Volume: 7.3 litres
Quick explanation of some kiln lingo:
Target temperature: the temperature you want your kiln to heat up to (or cool down to), i.e. the temperature you need to fire your material at.
Digital controller: how you tell your kiln what to do. With a digital controller you press buttons. Older (or simpler) kilns sometimes just have a rotary controller which you turn until you're happy with the temp. - digital controllers are much easier to control.
Ramp function: a function which allows you to tell the kiln how fast (or slow) it should heat up/cool down. Mostly used in glass fusing and for some base metal clay firings, or for other materials which needs heating and/or cooling under more controlled conditions.
Ramp speed: the speed at which the kiln heats up, or cools down.
Hold time: how long your kiln should hold the target temperature. E.g., fire at 650°C for 30 minutes - 30 minutes is the hold time.
Firing chamber: the inside of your kiln, where you place your things to be fired.
Kiln shelf: a small shelf on which you fire things. Never fire direct on the kiln floor.
12 month manufacturer's warranty. Excluding improper storage and usage.